电源的组成及工作原理（国外英文资料）.docVIP

电源的组成及工作原理（国外英文资料） The composition and working principle of the power supply The AT power supply on the ATX power supply circuit structure is complex, each part of the circuit not only cooperate with each other, mutual penetration on the function, and the circuit parameters setting is very strict, slightly improper circuit doesnt work. Figure, ATX circuit principle can be seen from the graph, the circuit can be divided into two parts: the part is from the power input to the switch before the transformer T1 circuit (including the original edge of auxiliary power supply circuit), the part of the circuit and ac 220 v voltage directly connected, touch will be affected by electric shocks, known as the high voltage side circuit; The other part is the circuit of the switch transformer T1, which is not connected directly to ac 220V, which is called the low voltage side circuit. The two are circuits of C03, C04 and C05 high-voltage ceramic capacitors to eliminate electrostatic interference. Its principle block diagram is shown in figure 2, you can see from the picture the machine by the ac input circuit, rectifier, filter circuit, push pull switch circuit, auxiliary switch power supply, PWM pulse width modulation circuit, PS - ON control circuit, protection circuit, output circuit and PW - OK signal form of circuit. To figure out each part of the working principle of the circuit and the relationship between the maintenance judgment fault is very useful for us to, the following brief introduction of the working principle of each component. The power of the ATX power supply First of all a + 5 v SB ATX control signals, PS - ON, PW - OK, ATX switch power supply with the AT power supply is the most significant difference, ATX power supply is cancelled the traditional mains switch, through the + 5 v SB and PS - ON the combination of the control signal to realize the power switch. + 5 v SB is for the host system when ATX standby power supply, as well as open and close automaticall